Luna E-1 No.1,[1] sometimes identified by NASA as Luna 1958A,[2] was a SovietLuna E-1 spacecraft which was intended to impact the Moon. It did not accomplish this objective as it was lost in a launch failure. It was the first of four E-1 missions to be launched.[3]

Luna E-1 No.1 was a 361-kilogram (796 lb) spacecraft which marked the first Soviet attempt to send a spacecraft to the towards the Moon. It was also the first mission of the Luna programme. The spacecraft was intended to release 1 kilogram (2.2 lb) of sodium, in order to create a "comet" of the metal which could be observed from Earth, allowing the spacecraft to be tracked.[4] Prior to the release of information about its mission, NASA correctly identified that it had been an attempted lunar impact mission.[2]

Chief Designer Sergei Korolev's ambitious space plans were being continually frustrated by design changes to the R-7 missile, launch failures, and the fact that the ICBM program took priority. On 10 July 1958, a test version of the Luna booster was flown which had a dummy upper stage (live avionics, but no engine) in order to try out the modifications to the R-7, which included a stronger airframe to support the added weight of the upper stage and more powerful engines (these engines had first been tested on Sputnik 3's booster a few months earlier). Unfortunately, an electrical short resulted in the booster crashing near the pad shortly after liftoff. Repair work on LC-1 had to be done quickly for the launch of an all-up 8K72 the next month.

As Korolev knew that the United States was planning to launch a lunar probe on 17 August, he faced considerable pressure getting the Luna and its booster ready for launch. Despite a number of technical issues, the pad crews managed to get the booster ready on the 17th, but Korolev instead decided to let the US flight go first on the reasoning that the Luna probe had a shorter trajectory to travel and would reach the Moon first. After that launch ended in a booster explosion, he decided to postpone the flight until the glitches with the 8K72 and Luna could be worked out.